Bi-2223 Test Coils for High Resolution NMR Magnets.
Bi-2223 Test Coils for High Resolution NMR Magnets.
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用于高分辨率 NMR 磁体的 Bi-2223 测试线圈。
DOI：
10.1109/tasc.2017.2652378
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
White,JM
中科院分区：
文献类型：
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作者：
Marshall,WS;Bird,MD;Godeke,A;Larbalestier,DC;Markiewicz,WD;White,JM
最近，通过采用高强度镍合金层压，Bi-2223 导体的应变容限得到了显着改善。该导体由住友电工提供，型号为 HT-NX，现已上市，其长度足以制造高均匀性螺线管。国家强磁场实验室 (NHMFL) 目前正在进行一项充分利用改进的导体特性的计划。正在制作五个线圈，最后一个线圈是为了演示在 10 毫米体积上接近 1 GHz 和 1 ppm 的 NMR 测量。在此过程中，我们期望展示与 30-T NMR 磁体中预期类似的临界电流分数和应变。这些线圈将在 NHMFL 现有的 16 特斯拉大口径背景磁体内进行测试。首先介绍了 NMR 演示线圈的设计，并给出了场、均匀性和应变的预期值。然后概述了技术开发计划，其中包括制造四个测试线圈以测试各种设计功能、开发制造工具和培训人员。
Recently, significant improvement in the strain tolerance of Bi-2223 conductor has been achieved by lamination with high strength nickel alloy. The conductor, supplied by Sumitomo Electric and designated Type HT-NX, is now commercially available in lengths sufficient for manufacture of high-homogeneity solenoids. A program to fully exploit the improved conductor properties is now underway at the National High Magnetic Field Laboratory (NHMFL). Five coils are being made, the last of which is to demonstrate an NMR measurement approaching 1 GHz and 1 ppm over 10-mm volume. In so doing, we expect to demonstrate critical current fraction, and strain similar to that expected in 30-T NMR magnets. The coils will be tested inside an existing 16 Tesla large-bore background magnet at the NHMFL. The design of the NMR demonstration coil is presented first, with expected values for field, homogeneity, and strain given. A technology development program is then outlined, which includes fabrication of four test coils to test various design features, develop fabrication tooling, and train personnel.